/*
 * Copyright (C) 2001-2016 Food and Agriculture Organization of the
 * United Nations (FAO-UN), United Nations World Food Programme (WFP)
 * and United Nations Environment Programme (UNEP)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 *
 * Contact: Jeroen Ticheler - FAO - Viale delle Terme di Caracalla 2,
 * Rome - Italy. email: geonetwork@osgeo.org
 */

package org.fao.geonet.csw.common;

import org.fao.geonet.csw.common.exceptions.InvalidParameterValueEx;
import org.fao.geonet.csw.common.exceptions.MissingParameterValueEx;

/**
 * Check that constraint language is one of CQL or FILTER.
 */
public enum ConstraintLanguage {
    CQL("CQL_TEXT"), FILTER("FILTER");

    //------------------------------------------------------------------------

    private String language;

    //------------------------------------------------------------------------

    private ConstraintLanguage(String language) {
        this.language = language;
    }

    /**
     * TODO javadoc.
     */
    public static ConstraintLanguage parse(String language) throws MissingParameterValueEx, InvalidParameterValueEx {
        if (language == null)
            throw new MissingParameterValueEx("constraintLanguage");

        if (language.equals(CQL.toString())) return CQL;
        if (language.equals(FILTER.toString())) return FILTER;

        throw new InvalidParameterValueEx("constraintLanguage", language);
    }

    //------------------------------------------------------------------------

    public String toString() {
        return language;
    }
}
